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Title
Japanese: 
English:Electronic structures and photoanodic properties of ilmenite-type MTiO3 epitaxial films (M = Mn, Fe, Co, Ni) 
Author
Japanese: 吉松 公平, 増子尚徳, 梅澤直人, 堀場弘司, 組頭 広志, 大友 明.  
English: K. Yoshimatsu, Hisanori Mashiko, Naoto Umezawa, Koji Horiba, Hiroshi Kumigashira, A. Ohtomo.  
Language English 
Journal/Book name
Japanese: 
English:The Journal of Physical Chemistry C 
Volume, Number, Page Vol. 121        pp. 18717-18724
Published date Aug. 3, 2017 
Publisher
Japanese: 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b06076
 
DOI https://doi.org/10.1021/acs.jpcc.7b06076
Abstract We performed systematic study on electronic structures and photoelectrochemical (PEC) properties of ilmenite-type MTiO3 (M = Mn, Fe, Co, and Ni) thin-film photoanodes for water oxidation reactions. Single-phase MTiO3 films were grown on α-Al2O3 substrates by using pulsed-laser deposition. Formation of the ilmenite-type structures and oxidation states of M2+Ti4+O3 were revealed by X-ray diffraction and X-ray absorption spectroscopy, respectively. The PEC performance in water was investigated by linear sweep voltammetry under Xe-lamp illumination and incident photon to conversion efficiency measurements under monochromatic illumination. We found that NiTiO3 acted as the most effective photoanode among MTiO3. The mechanism of the different PEC performance was discussed from the viewpoint of the electronic structures investigated by photoemission spectroscopy and band calculation based on density functional theory. We revealed that the stronger hybridization between O 2p and M 3d states was responsible for the more efficient photoanodic activity among ilmenite-type MTiO3.

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